The Stuxnet worm traced to the Bible!

The Stuxnet, computer virus designed to attack industrial-control systems from Siemens AG has hit the computers of 6 million individuals and nearly 1,000 enterprises in China, the state-run Xinhua News Agency reported Wednesday, in the latest sign of the spread of the virus.

Iranian officials this week said the virus had infected computer systems at Iran’s first nuclear-power plant.

Deep inside the computer worm that some specialists suspect is aimed at slowing Iran’s race for a nuclear weapon lies what could be a fleeting reference to the Book of Esther, the Old Testament tale in which the Jews pre-empt a Persian plot to destroy them.

That use of the word “Myrtus” — which can be read as an allusion to Esther — to name a file inside the code is one of several murky clues that have emerged as computer experts try to trace the origin and purpose of the rogue Stuxnet program, which seeks out a specific kind of command module for industrial equipment.

Then there is the allusion to myrtus — which may be telling, or may be a red herring.

Several of the teams of computer security researchers who have been dissecting the software found a text string that suggests that the attackers named their project Myrtus. The guava fruit is part of the Myrtus family, and one of the code modules is identified as Guava.

But some security experts see the reference as a signature allusion to Esther, a clear warning in a mounting technological and psychological battle as Israel and its allies try to breach Tehran’s most heavily guarded project. Others doubt the Israelis were involved and say the word could have been inserted as deliberate misinformation, to implicate Israel.

“The Iranians are already paranoid about the fact that some of their scientists have defected and several of their secret nuclear sites have been revealed,” one former intelligence official who still works on Iran issues said recently. “Whatever the origin and purpose of Stuxnet, it ramps up the psychological pressure.”

The reports on Iran show a fairly steady drop in the number of centrifuges used to enrich uranium at the main Natanz plant. After reaching a peak of 4,920 machines in May 2009, the numbers declined to 3,772 centrifuges this past August, the most recent reporting period. That is a decline of 23 percent.

It was Mr. Langner who first noted that Myrtus is an allusion to the Hebrew word for Esther. The Book of Esther tells the story of a Persian plot against the Jews, who attacked their enemies pre-emptively.

“If you read the Bible you can make a guess,” said Mr. Langner, in a telephone interview from Germany.